McCANNALOK CRYOGENIC VALVE
Installation, Operation and Maintenance Manual
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contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
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10.10 Knock out taper pins (23) using a rod or punch on small end of pin
(opposite tack weld). It may be necessary to lift body (1) and rotate
disc (2) slightly to do this. Make sure disc (2) is resting on wood blocks
since it will swing freely on stem (3) with pins removed. When taper
pins (23) are out, lay body (1) down so disc (2) and body (1) are evenly
supported on flat surface.
10.11 Using a brass bar or drift punch, knock stem (3) loose from bottom of
valve and pull from bonnet (33). After long or severe service this may
take considerable force.
CAUTION
Be careful not to damage bearings (8), disc spacers (9), body (1) or bonnet (33).
10.12 Disc spacers (9) are used at top and bottom of disc (2) to properly
position disc (2) in body (1). Proper spacers were selected at initial
assembly and rarely require replacement. The location of these spacers
should be noted, and the spacers marked at disassembly so that they
are reinstalled in the same positions, top and bottom.
10.13 Separate body (1) from disc (2), and remove thrust washer (12) from
packing bore.
10.14 Examine body bearings (8A/8B) for excessive wear. Two body bearings
are located in the body (1) near the disc spacers (9), one stem bearing
is located in the bonnet (33) below the thrust washer (12). If removed
from body (1) or bonnet (33), note position of stem bearing and mark
to reinstall in same location. If bearing liner is worn through to the shell,
or if severe damage is evident on the bearing, it should be replaced.
Replacement is rarely needed.
10.15 Clean body (1) and bonnet (33) thoroughly to remove all dirt, foreign
matter, rust, etc.
WARNING
If this valve is to be reinstalled into a oxygen cleaned service, the cleaning and
reassembly of this product needs to occur in a clean room environment via
approved procedure.
10.16 Place the body (1) flat, seat retainer side facing down, and support it
on wooden blocks sufficiently above the work surface as to facilitate
insertion of the disc (2) in open position. Assemble disc spacers (9) into
each stem hole counterbore on ID of body (1). Lower the disc (2) into
position, aligning the bores in body (1) and disc (2).
10.17 Insert new stem (3) in the bonnet (33), through the body (1),
bearings (8), disc spacers (9), and disc (2).